Wide-viewing angle display device and fabrication method for thereof

Abstract

A wide-viewing angle display device serves as a multi-domain vertical alignment (MVA) mode liquid crystal display (LCD) device or an in-plane switching (IPS) mode liquid crystal display (LCD) device. A plurality of protrusions is formed on the inner surface of the glass substrate, and an electrode array is formed on the tops of the protrusions. Thus, the electrodes are suspended in the liquid crystal cell gap, and a transverse electrical field is generated by the electrodes to drive the liquid crystal molecules.

What is claimed is:  
     
       1. A wide-viewing angle display device which is a multi-domain vertical alignment (MVA) mode liquid crystal display (LCD) device, comprising: 
       an upper glass substrate and a lower glass substrate disposed parallel to each other;  
       a liquid crystal layer of positive dielectric anisotropy formed in a space between the upper glass substrate and the lower glass substrate;  
       a plurality of first protrusions formed on the inner surface of the upper glass substrate;  
       a plurality of common electrodes formed on the tops of the first protrusions, respectively;  
       a plurality of second protrusions formed on the inner surface of the lower substrate, in which the first protrusions and the second protrusions are arranged alternately; and  
       a plurality of pixel electrodes formed on the tops of the second protrusions, respectively, in which the pixel electrodes and the common electrodes are arranged alternately;  
       wherein, after applying a voltage to the display device, a transverse electrical field is generated between the common electrode and the pixel electrode to drive the liquid crystal molecules, and two alignment domains are formed at both sides of the first protrusion.  
     
     
       2. The wide-viewing angle display device of  claim 1 , further comprising: 
       a first alignment layer covering the first protrusions and the common electrodes on the upper substrate.  
     
     
       3. The wide-viewing angle display device of  claim 1 , further comprising: 
       a second alignment layer covering the second protrusions and the pixel electrodes on the lower substrate.  
     
     
       4. The wide-viewing angle display device of  claim 1 , wherein each the first protrusion and the second protrusion is a photoresist layer, a polymer layer or an oxide layer. 
     
     
       5. The wide-viewing angle display device of  claim 1 , wherein each top of the common electrodes and each top of the pixel electrodes are on the same plane. 
     
     
       6. The wide-viewing angle display device of  claim 1 , wherein each of the first protrusion and the second protrusion has a tripe profile, an arc profile, a sawtooth-shaped profile, a -shaped profile, a ┐-shaped profile or a ┌-shaped profile. 
     
     
       7. A wide-viewing angle display device which is a multi-domain vertical alignment (MVA) mode liquid crystal display (LCD) device, comprising: 
       an upper glass substrate and a lower glass substrate disposed parallel to each other;  
       a liquid crystal layer of positive dielectric anisotropy formed in a space between the upper glass substrate and the lower glass substrate;  
       a plurality of first common electrodes formed on the inner surface of the upper glass substrate;  
       a plurality of second common electrodes formed on the inner surface of the lower substrate, in which the second common electrodes are positioned corresponding to the first common electrodes, respectively;  
       a plurality of protrusions formed on the inner surface of the lower substrate, in which the protrusions and the second common electrodes are arranged alternately; and  
       a plurality of pixel electrodes formed on the tops of the protrusions, respectively, in which the pixel electrodes and the second common electrodes are arranged alternately;  
       wherein, after applying a voltage to the display device, a transverse electrical field is generated between the second common electrode and the pixel electrode to drive the liquid crystal molecules, and two alignment domains are formed at both sides of the protrusion.  
     
     
       8. The wide-viewing angle display device of  claim 7 , further comprising: 
       a first alignment layer covering the first common electrodes and the upper substrate.  
     
     
       9. The wide-viewing angle display device of  claim 7 , further comprising: 
       a second alignment layer covering the protrusions, the pixel electrodes, and the second common electrodes on the lower substrate.  
     
     
       10. The wide-viewing angle display device of  claim 7 , wherein the protrusion is a photoresist layer, a polymer layer or an oxide layer. 
     
     
       11. The wide-viewing angle display device of  claim 7 , wherein each top of the pixel electrodes is higher than each top of the second common electrodes. 
     
     
       12. The wide-viewing angle display device of  claim 7 , wherein the protrusion has a tripe profile, an arc profile, a sawtooth-shaped profile, a -shaped profile, a ┐-shaped profile or a ┌-shaped profile. 
     
     
       13. The wide-viewing angle display device of  claim 7 , wherein each the first common electrode and the second common electrode has a tripe profile, an arc profile, a sawtooth-shaped profile, a -shaped profile, a ┐-shaped profile or a ┌-shaped profile. 
     
     
       14. A wide-viewing angle display device which is an in-plane switching (IPS) mode liquid crystal display (LCD) device, comprising: 
       an upper glass substrate and a lower glass substrate disposed parallel to each other;  
       a liquid crystal layer formed in a space between the upper glass substrate and the lower glass substrate;  
       a plurality of first protrusions formed on the inner surface of the lower glass substrate;  
       a plurality of second protrusions formed on the inner surface of the lower substrate, in which the first protrusions and the second protrusions are arranged alternately;  
       a plurality of first electrodes formed on the tops of the first protrusions, respectively; and  
       a plurality of second electrodes formed on the tops of the second protrusions, respectively, in which the first electrodes and the second electrodes are arranged alternately;  
       wherein, after applying a voltage to the display device, a transverse electrical field is generated between the first electrode and the second electrode to drive the liquid crystal molecules.  
     
     
       15. The wide-viewing angle display device of  claim 14 , further comprising: 
       a first alignment layer formed on the inner surface of the upper substrate.  
     
     
       16. The wide-viewing angle display device of  claim 14 , further comprising: 
       a second alignment layer covering the first protrusions, the second protrusions, the first electrodes, and the second electrodes on the lower substrate.  
     
     
       17. The wide-viewing angle display device of  claim 14 , wherein each of the first protrusions and the second protrusion is a photoresist layer, a polymer layer, or an oxide layer. 
     
     
       18. The wide-viewing angle display device of  claim 1 , wherein each top of the first electrodes and each top of the second electrodes are at the same plane. 
     
     
       19. The wide-viewing angle display device of  claim 14 , wherein each the first protrusion and the second protrusion has a -shaped successive profile. 
     
     
       20. A fabrication method for a wide-viewing angle display device, comprising steps of: 
       providing a glass substrate;  
       forming a protrusion layer on the glass substrate;  
       patterning the protrusion layer to form a plurality of first protrusions and second protrusions, in which the first protrusions and the second protrusions are arranged alternately;  
       forming a conductive layer on the glass substrate to cover the first protrusions and the second protrusions; and  
       performing photolithography and etching to remove the conductive layer outside the tops of the first protrusions and the tops of the second protrusions, in which the remaining portion of the conductive layer on the top of the first protrusion serves as a first electrode, and the remaining portion of the conductive layer on the top of the second protrusion serves as a second electrode.  
     
     
       21. The fabrication method for a wide-viewing angle display device of  claim 20 , further comprising a step of: 
       forming an alignment layer on the exposed surface of the first protrusions, the second protrusions, the first electrodes, and the second electrodes.  
     
     
       22. The fabrication method for a wide-viewing angle display device of  claim 20 , wherein each the first protrusion and the second protrusion is a photoresist layer, a polymer layer or an oxide layer. 
     
     
       23. The fabrication method for a wide-viewing angle display device of  claim 20 , wherein the top of the first electrode and the top of the second electrode are on the same plane. 
     
     
       24. The fabrication method for a wide-viewing angle display device of  claim 20 , further comprising a step of: 
       forming a plurality of third electrodes on the inner surface of the glass substrate, in which the third electrode is positioned between the first protrusion and the second protrusion.  
     
     
       25. The fabrication method for a wide-viewing angle display device of  claim 20 , wherein each the first electrode and the second electrode has a tripe profile, an arc profile, a sawtooth-shaped profile, a -shaped profile, a┐-shaped profile or a ┌-shaped profile. 
     
     
       26. The fabrication method for a wide-viewing angle display device of  claim 20 , wherein the wide-viewing angle display device is a multi-domain vertical alignment (MVA) mode liquid crystal display (LCD) device or an in-plane switching (IPS) mode liquid crystal display (LCD) device.